Technical Radio working- no sound

[akn]

Hi all,
Can anyone suggest anything to try. I have a 2008 Bravo. The radio is working in terms of use, display etc but there is no sound. I have replaced the two fuses which had a link with radio & speakers but still no joy.

I did have my mirror broken the other day and from that radio wont work, I can't see this having been an issue? Glass in mirror is moving so wiring didnt get broken.

Thanks for help in advance